A friend tells me there is one and I saw a few people carrying Philz paper cups around after security in the international terminal, but didn't have time to ask where the store was.
No. Philz does not have a location at the airport.
As best I can tell, none of SFO's vendors brew Philz coffee either. There are a number of Peet's and Starbucks locations, and various other retailers that serve Equator Coffee, Flying Goat Coffee, wherever Joe & The Juice gets its coffee from, and Emporio Rulli roasts their own.
There are Philz locations within six miles from the airport in South San Francisco, San Mateo, and Burlingame.
I got a reply from a message I sent to Philz:
Thanks for reaching out! Unfortunately, we don't have a coffee shop at SFO and don't have any immediate plans to open one.
Our bagged beans are periodically available for purchase at the Duty Free Shop found in the international terminal. This may be what your friend was referring to which may have caused the confusion.
Seems I must have been mistaken.